The SN74AVC8T245-Q1 is an 8-bit noninverting bus transceiver that uses two separate
configurable power-supply rails. The SN74AVC8T245-Q1 operation is optimimal with
VCCA and VCCB set at
1.4 V to 3.6 V. It is operational with VCCA and
VCCB as low as 1.2 V. The A port is designed to track
VCCA. VCCA accepts any supply voltage from 1.2 V to
3.6 V. The B port is designed to track VCCB. VCCB
accepts any supply voltage from 1.2 V to 3.6 V. This allows for universal low-voltage bidirectional
translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes.
The SN74AVC8T245 design enables asynchronous communication between data buses. The device
transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic
level at the direction-control (DIR) input. One can use the output-enable
(OE) input to disable the outputs so the buses are effectively
In the SN74AVC8T245 design, VCCA supplies the control pins (DIR
This device specification covers partial-power-down applications using
Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through a powered-down device.
The VCC isolation feature ensures that if either
VCC input is at GND, both ports are in the high-impedance state.
To ensure the high-impedance state during power up or power down, tie
OE to VCC through a pullup resistor; the
current-sinking capability of the driver determines the minimum value of the resistor.
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